package com.vcc.web.core.resolver;

import com.vcc.core.annotations.CurrentUserId;
import com.vcc.core.exception.ProgramException;
import com.vcc.core.exception.SignInException;
import org.springframework.core.MethodParameter;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

public class CurrentUserIdMethodArgumentResolver implements HandlerMethodArgumentResolver {
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().isAssignableFrom(Long.class) && parameter.hasParameterAnnotation(
                CurrentUserId.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        if (StringUtils.isEmpty( webRequest.getAttribute("userId", RequestAttributes.SCOPE_REQUEST))) {
            throw new SignInException("登陆失效");
        }
        return (Long)webRequest.getAttribute("userId", RequestAttributes.SCOPE_REQUEST);
    }
}
